Sifting apparatus



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SIFTING APPARATUS. No. 469,601. Patented Feb. 23, 18-92.

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SIPTING APPARATUS.

NO. 469,601. Patented Feb. 23, 1892.

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UNITED STATES PATENT OFFICE.

HEINRICH seen, or DRESDEN, GERMANY.

SIFTING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 469,601, dated February23, 1892.

Application filed March 30, 1891. Serial No. 386,993. (No model.)

To all whom it may concern.-

Be itknown thatI, HEINRICH SEGK, of Dresden, in the Kingdom of Saxonyand German Empire, have invented a certain new and useful Improvement inSitting Apparatus, of which the following is a specification.

This invention relates to an improvement in sifting apparatus, moreparticularly of the kind employed for sifting flour, meal, and otherpulverous substances; and the object of my said invention is to providemeans for thoroughly agitating and shaking up such flour, meal, or othersubstance in being sifted, so as to bring every particle thereof intointimate and repeated contact with the sifting surfaces of the apparatusin passing through the latter.

My invention therefore consistsin a sifting apparatus in which theflour, meal, or other substance to be sifted is by reason of thepeculiar construction and manner of moving the said apparatus caused topass with a positive movement between two sifting-surfaces or between asifting-surface and a solid or impervious wall or surface in such amanner as to be in a vertical sense tangentially thrown against thesifting surface or surfaces of the apparatus by giving the oppositesifting-surfaces a line of movement corresponding to a succession offull circles or other curved lines and having a direction perpendicularor rectangular to the plane of the sifting surface or surfaces, byreason of which movement the flour, meal, or other substance moving insuch circular or curved line or di rection will at regular intervals bebrought into contact with projections or ribs arranged at certaindistances from each other on the inner side of one of thesifting-surfaces moved in such circular or curved line or direction.

In the accompanying drawings, forming part of this specification, Figure1 is a vertical longitudinal section of asifting apparatus embodying myinvention and here shown as being arranged in an inclined position, theplane of section being on a line similar to the line 00 m, Fig. 3, inwhich figure substantially V the same apparatus is shown arranged in a Band journaled in suitable bearings on the A frame. A designates a casingmounted. loosely on the said crank-shaft and having crankpins 6 elikewise journaled in suitable bear ings arranged on the frame. The saidcasing or sifting apparatus proper A is provided within with twoparallel sifting-surfaces a and b, one of them at having a number ofprojections or ribs 0 directed inwardly.

dis an inlet-opening foradmitting the flour, meal, or other substance tobe sifted, which enters the casing A at f, and is introduced between thetwo sifting-surfaces a and b from below, the latter being, by reason ofthe motion transmitted to the casing A from the shaft w and pulley B,gyrated or swung in a circle, thereby causing the flour, meal, or othersubstance to be agitated between the said sifting-surfaces and thrown toand fro from one surface to the other and against the sift ing-surfaces,and to be at the same time moved slowly toward the delivery end of thecasing, although, by reason of the direction of movement of the gyratingcasing in the arrangement, as shown in Fig. 1, it will be continuallythrown backagain in the direction toward the inlet end. It is by reasonof just this direction of movement, however, that the desired result isobtained when the sifting-surfaces are arranged in an inclined orhorizontal position, as the fiour, meal, or other substance to be siftedwould, if the easing were gyrated in the opposite direction, be thrownin a moment through the entire length of the space between the twosurfaces without becoming thoroughly sifted in passing.

- The letter 9 indicates an opening for receiving the unsifted residueescaping from the upper end of the apparatus, and h indi cates a similaropening arranged below the bottom of the apparatus, into which openingthe sifted material dropping down from the sifting surface or surfacesis discharged.

The manner in Which the flour or other substance to be sifted is movedonward in passing between the sifting surfaces may be briefly explainedas follows: Supposing a cer tain quantity of fiour had been introducedat finto the space between the walls a and b, now when the casing ismoved in the direction of the arrow, or, in other words, when it atfirst moves in a downward direction the flour, by reason of inertia,will have a tendency to reoccupy its previous position-thatis to say, itwill move upward and adhere to the surface Z2. As the casing nowcontinues its gyrating movement and thereby moves to the right, thesubstance to be sifted will be removed from the wall I) to be caught bythe projections or ribs 0 on the wall a, being, during' the upwardmovement of the casing A, held on the said wall a and prevented fromdropping down therefrom through the said projections or ribs 0. It willthen be carried upward with the casing, and during and in consequence ofthe subsequent movement of the latter to the left the said substancewill again be thrown against the surface I) to the right, striking thesame, however, on a higher point thereof, where it will then againadhere, while the casing now again moves in a jections or ribs, whichwill then in turn throw the said substances to be sifted against theopposite sifting-surfaces 1), thereby causing it to gradually movein anupward direction. It

is evident that this movement will cause thesaidsubstancestobecomethoroughlyagitated,

' and by being thus thrown against the sifting surface or surfaces withgreat force or in]- petus to be sifted in a much more effective mannerthan has been possible with the rocking sieves heretoforeusuallyemployed.

words, be explained by saying that the speed imparted to the apparatusand in turn by the latter to the material to be sifted, is such as tocause theeifect of the impulses thereby imparted to the material toovercome the effect of gravity.

Instead of having projections or ribs the sides may also be formed witha number of projecting angles and corresponding recesses,

as shown in detail in Fig. 4; also, instead of one both surfaces may beprovided with the said projections, ribs, angles, or recesses. Moreover,instead of both surfaces moving in the manner as described, one of themmay remain stationary while the other is moved.

Having thus fully described my invention,

what I desire to claim and secure byLetters the surfaces, anoutlet-opening at the other end for the unsifted residue, and an outletfor the sifted material, of means for imparting to at least one of thesaid sifting-surfaces a swinging movement corresponding to a successionof endless curved lines the planes of which will be rectangular to thesaid surfaces and the movement being so directed as to cause thematerial to be thrown against the surface having the projections in adirection toward the inlet end of the apparatus, substantially as andfor the purpose set forth.

2. In asifting-surface, the combination, with a casing having aninlet-opening for the material to be sifted, an outlet-opening for theunsifted residue, and an outlet for the sifted material, of twosifting-surfaces arranged opposite each other within the said casing, asdescribed, and one of them provided with transversely-arrangedprojections, as described, and means for imparting to the said casingand to the sifting-surfacessa common swinging movement corresponding toa succession of endless curved lines, the planes of which will berectangular to the said surfaces and the movement being so directed asto cause the material to be thrown against the surface having theprojections in-adirec tion toward the inlet end of the apparatus,substantially as and for the purpose set forth.

3 In a sitting apparatus having two sur* faces arranged opposite eachother, as described, one of which may be a sifting-surface and the othercan impervious surface, and one of the said surfaces having transversely-arranged projections, as described, the combination, with thesaid surfaces, of a frame or casing having an inlet-opening .at one endfor the material to be sifted between the surfaces, an outlet-opening atthe other end for the unsifted residue, and an outlet The action, asabove described, may,in other for the sifted material, of means forimparting to at least one of the said surfaces a swinging movementcorresponding to a succession of endless curved lines, the planes ofwhich will be rectangular to the said surfaces and the movement being sodirected as to cause the material to be thrown against the surfacehaving the projections in a direction toward the inlet end of theapparatus, substantially as and for the purpose set forth.

4. In a sifting apparatus, the combination, with a casing having aninlet-opening for the material to be sifted, an outlet-opening for theunsifted residue, and an outlet for the sifted material, of two-surfacesarranged opposite each other within the said casing, as described, oneof which may be a sifting-surface and the other an impervious surfaceand one of them provided with transverselyarranged projections, asdescribed, and means for imparting to the said casing and to thesurfaces a common swinging movement corresponding to a succession ofendless curved lines, the planes of which will be rectangular to thesaid surfaces and the movement being so directed as to cause thematerial to be thrown against the surface having the projections in adirection toward the inlet end of the apparatus, substantially as andfor the purpose set forth.

5. In a sifting apparatus, the combination of a-number of surfacesarranged parallel or substantially parallel to each other, theintermediate spaces between the surfaces being provided on-one side witha number of transversely-arranged projections, as described, and one orboth sides being a sifting surface or surfaces, means for introducinginto the said intermediate spaces at one end the material to be siftedand for discharging at the other end the unsifted residue, one or moreoutlets for the sifted material, and means for Witnesses PAULDRUCKMULLER, FRITZ DEITRICK.

